4(1)
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4(2)
The functions of a library authority as such shall be exercisable within an area (in this Act referred to as a "library area") consisting of the administrative area of the authority, or . . .
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in the case of a joint board established under section 5 below, consisting of the areas which, if the authorities constituting the board were library authorities, would form their library areas,
and may also be exercised elsewhere than within its library area if the authority thinks fit.
4(3)
In Wales, county councils and county borough councils shall, subject to section 5 below, be library authorities for the purposes of this Act.